They are small bulbs with 2 to 4 cm in diameter.

The bulbs will be shipped no root and no foliage/stalks
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AMARYLLIS Rozetta -- A "Showy" double that has tousled wavy, petals that are dramatic and draw your eyes back again & again.  PHOTO COURTESY OF www.emaryllis.com

Hadeco Amaryllis are an exciting new development in the Horticultural world. Size for size, they will outperform any others as far as number of stalks per bulb, number of blooms per stalk and size of blooms is concerned. Developed especially for pot culture, these amaryllis have stout stems and the leaves often grow simultaneously with the flowers. All Hadeco varieties have passed through extensive testing and are among the very best hippeastrum hybrids in the world. They are selected to be easily forced, long lasting, and disease resistant.

Bulbs are officially 24-26 cm around. This was the approximate size at harvest time, but normally the bulbs shrink in storage. I would describe the bulbs as the size of a baseball. There is some variation with each variety, and actual size depends on the harvest each year.

 

Amaryllis can be planted in a small pot (not much larger than the bulb) 4 X 4 Is big enough for 24 cm Cir bulbs. You want about ½ an inch to an inch between the bulb and the edge of the pot.

Plant your amaryllis with part of the bulb out of the soil.  In fact, in pots sometimes the whole bulb is above the soil, so that the roots can have more soil under the bulb to grow into. Also this prevents water from getting into the neck of the bulb easily.  Water well after planting and then water only after the soil starts to dry out.  Once every week or so should be enough. Under watering is better than over watering. Usually I plant them outside after they are done blooming for the first time, but we live in Arizona so if you have frost you will need to keep your plant inside or in a protected area so the bulb doesn't freeze. They are very drought and heat resistant and will re-bloom naturally in the spring once they are established.  

Those are the basics

To Plant Amaryllis out side:

Plant your bulb(s) in dappleded shade (if you have lots of sun in your area).  If the area you live in has dappled shade/good cloud cover for the summer then you can plant wherever you wish.  The other main requirement is freely draining soil.  If you water the area and water is still puddled on the surface after 15 min then you need to amend the soil, you can use sand (½ sand ½ native soil,) you can mix in ½ bark chunks/saw dust/wood shavings instead of sand if you prefer, or not plant there.  Once you have the area you are planning to plant decided on/prepared then you can plant your bulbs.  You can plant them as close as 3 inches apart (that will be slightly crowded) or any larger increment  you like.  You want to plant the bulb(s) so the neck is slightly above the soil and water doesn’t get into the neck of the bulb(s) and cause fungus/other diseases.  Water heavily right after you plant,  then give them a good soaking once a week.  If the water is puddling up then stop watering.  It is better to under water then over water.